STUTTGART, GERMANY - APRIL 22: Tennis player Maria Sharapova smiles during a presentation as she is unveiled as car manufacturer Porsche's new brand ambassador at the Porsche Museum on April 22, 2013 in Stuttgart, Germany.

STUTTGART, GERMANY - APRIL 22: Tennis player Maria Sharapova arrives for a media presentation as she is unveiled as car manufacturer Porsche's new brand ambassador at the Porsche Museum on April 22, 2013 in Stuttgart, Germany.

STUTTGART, GERMANY - APRIL 22: Tennis player Maria Sharapova poses for the media next to a Porsche 911 Carrera 4 Cabriolet as she is unveiled as car manufacturer Porsche's new brand ambassador at the Porsche Museum on April 22, 2013 in Stuttgart, Germany.

STUTTGART, GERMANY - APRIL 22: Tennis player Maria Sharapova poses for the media next to a Porsche 911 Carrera 4 Cabriolet as she is unveiled as car manufacturer Porsche's new brand ambassador at the Porsche Museum on April 22, 2013 in Stuttgart, Germany.

STUTTGART, GERMANY - APRIL 22: Tennis player Maria Sharapova poses for the media as she is unveiled as car manufacturer Porsche's new brand ambassador at the Porsche Museum on April 22, 2013 in Stuttgart, Germany.

STUTTGART, GERMANY - APRIL 22: Tennis player Maria Sharapova poses for the media next to a Porsche 911 Carrera 4 Cabriolet as she is unveiled as car manufacturer Porsche's new brand ambassador at the Porsche Museum on April 22, 2013 in Stuttgart, Germany.

STUTTGART, GERMANY - APRIL 22: Tennis player Maria Sharapova poses in a Porsche 911 Carrera 4 Cabriolet as she is unveiled as car manufacturer Porsche's new brand ambassador at the Porsche Museum on April 22, 2013 in Stuttgart, Germany.

STUTTGART, GERMANY - APRIL 22: Tennis player Maria Sharapova poses for the media next to a Porsche 911 Carrera 4 Cabriolet as she is unveiled as car manufacturer Porsche's new brand ambassador at the Porsche Museum on April 22, 2013 in Stuttgart, Germany.

STUTTGART, GERMANY - APRIL 22: Tennis player Maria Sharapova poses for the media next to a Porsche 911 Carrera 4 Cabriolet as she is unveiled as car manufacturer Porsche's new brand ambassador at the Porsche Museum on April 22, 2013 in Stuttgart, Germany.

STUTTGART, GERMANY - APRIL 22: Tennis player Maria Sharapova poses for the media next to a Porsche 911 Carrera 4 Cabriolet as she is unveiled as car manufacturer Porsche's new brand ambassador at the Porsche Museum on April 22, 2013 in Stuttgart, Germany.

STUTTGART, GERMANY - APRIL 22: Tennis player Maria Sharapova poses for the media as she is unveiled as car manufacturer Porsche's new brand ambassador at the Porsche Museum on April 22, 2013 in Stuttgart, Germany.

STUTTGART, GERMANY - APRIL 22: Tennis player Maria Sharapova poses for the media next to a Porsche 911 Carrera 4 Cabriolet as she is unveiled as car manufacturer Porsche's new brand ambassador at the Porsche Museum on April 22, 2013 in Stuttgart, Germany.

STUTTGART, GERMANY - APRIL 22: Tennis player Maria Sharapova poses for the media as she is unveiled as car manufacturer Porsche's new brand ambassador at the Porsche Museum on April 22, 2013 in Stuttgart, Germany.

STUTTGART, GERMANY - APRIL 22: Tennis player Maria Sharapova poses for the media as she is unveiled as car manufacturer Porsche's new brand ambassador at the Porsche Museum on April 22, 2013 in Stuttgart, Germany.